decennium

[ dih-sen-ee-uh m ]
/ dɪˈsɛn i əm /

noun, plural de·cen·ni·ums, de·cen·ni·a [dih-sen-ee-uh] /dɪˈsɛn i ə/.

a period of ten years; a decade.

Origin of decennium

From Latin, dating back to 1675–85; see origin at decennial
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British Dictionary definitions for decennium

decennium

decennary (dɪˈsɛnərɪ)

/ (dɪˈsɛnɪəm) /

noun plural -niums, -nia (-nɪə) or -naries

a less common word for decade (def. 1)

Word Origin for decennium

C17: from Latin, from decem ten + annus year
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012